I just aquired a Technics SL1350 Direct drive turntable. It turns to slow probably about 25% to slow. I Turned the speed adjustment under the table. No change. I took of f the bearing cleaned and oiled, with no change. The unit looks almost new and would like tp save it. Has anyone had a problem like this with a direct drive unit? Guess I'm looking to find out if there is an easy fix. And if you had one fixec, was it expensive.